He met many problems ______ he was going over his lessons.

He met many problems ______ he was going over his lessons.

#58104

before

as soon as

since

while

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We have two basketballs ,________we don’t play them.

#57166

only

last

and

but

Don’t get off the bus _____ it has stopped.

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after

when

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---When shall we leave for Shanghai?---We won’t 　　　 we have visited all the places of interest in Nanjing.

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until

while

since

The film, Tales of Old Beijing, shows us ________ Beijing looked like many years ago.

#56051

how

that

which

what

Stop cutting trees, _______ the earth will become worse and worse.

#56446

and

then

because

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